Pain is one of the classic and most common symptoms of blood clots in the foot, typically caused by deep vein thrombosis. While deep vein thrombosis most commonly occurs in the thigh or lower leg, it can also be present in the foot, as Healthline explains.
Other symptoms of deep vein thrombosis include swelling in one foot or leg but not the other and leg cramps. In addition, a patch of skin may feel warm and turn pale, red or blue. However, only half of the patients who have deep vein thrombosis experience any symptoms. If deep vein thrombosis is left untreated, the blood clot can travel to the lungs and cause a pulmonary embolism, according to Healthline.